LE MODELE ARISTOCRATIQUE FRANCAIS ET ESPAGNOL DANS L'OEUVRE ROMANESQUE DE LESAGE. - L'HISTOIRE DE GIL BLAS DE SANTILLANE (UN CAS EXEMPLAIRE.)

PARIS4-BU Serpente (751052129) / SudocSudocFranceF

Spectres RMN des polysaccharides et de leurs dérivés : influence des substituants sur le déplacement chimique 13C

International audienc

Cellulose organic solutions: a nuclear magnetic resonance investigation

International audienc

Synthesis of Fe/Co alloy nanopowders by ultrasound-assisted electrochemistry

SCOPUS: cp.pinfo:eu-repo/semantics/publishe

Synthesis of copper–silver bimetallic nanopowders for a biomedical approach; study of their antibacterial properties

International audienceCopper-silver nanopowders (NPs) are synthesized using a combination of sonoelectrodeposition for the inner core and galvanic replacement reaction for the outer shell. These combined techniques provide pure copper core NPs and allow the replacement of the surface copper atoms by silver atoms. The different Cu-Ag NPs are characterized by transmission electron microscopy, centrifugal liquid sedimentation, X-ray diffraction, X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The diameter of NPs is approximately equal to 7 nm. X-ray photoelectron spectroscopy results tend to support a core-shell structure. The bactericidal properties of these NPs are tested against both Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) bacteria. The efficiency of these NPs seems essentially due to the release of Cu 2+ and Ag + ions. The study of different compositions of Cu-Ag NPs exhibits a good compromise against both S. aureus and E. coli when the silver atomic percentage is superior to 40%. Finally, tests of wound dressings impregnated with Cu 50 Ag 50 NP are performed and exhibit successfully their bactericidal properties